Vizio vp422hdtv10a won't turn on

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #21
    Re: Vizio vp422hdtv10a won't turn on

    ^correction above, "separate transistors"

    Looks like Y-sus is bad then.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

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    • eagle00799
      Badcaps Veteran
      • May 2012
      • 322
      • USA

      #22
      Re: Vizio vp422hdtv10a won't turn on

      So do I assume the buffers are ok? I hate to replace the Ysus just to have it blow again cause the buffers are bad.

      Comment

      • eagle00799
        Badcaps Veteran
        • May 2012
        • 322
        • USA

        #23
        Re: Vizio vp422hdtv10a won't turn on

        And they say to replace both Ysus and Xsus at the same time but I think the Xsus is ok.

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: Vizio vp422hdtv10a won't turn on

          This set doesn't chain ER circuits, so you do not need to do that.
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment

          • eagle00799
            Badcaps Veteran
            • May 2012
            • 322
            • USA

            #25
            Re: Vizio vp422hdtv10a won't turn on

            Ok Tom thanks for all your help I sure appreciate it, I ordered a used Ysus from ebay and i'll let you know the outcome.

            Comment

            • eagle00799
              Badcaps Veteran
              • May 2012
              • 322
              • USA

              #26
              Re: Vizio vp422hdtv10a won't turn on

              Ok I got a used Ysus off ebay and the voltage on VSC is -188.7v , when I power it on I get nothing on the screen. When I check voltages on the pins that go into the buffer board the first 2 pins on the first connecter CN5003 I get -35.4v and the third pin is a continuous MV reading, all other pins read -160.4v and CN5002 and CN5001 are all -160.4v. Any suggestions what to look at next?

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              • eagle00799
                Badcaps Veteran
                • May 2012
                • 322
                • USA

                #27
                Re: Vizio vp422hdtv10a won't turn on

                I unplugged the buffer board and checked pin voltages, the first 2 go from a negative -35.4v to a positive 22.4v with the 3rd pin doing the same with a continuous moving MV reading ,all other pins read -115.5v

                Comment

                • eagle00799
                  Badcaps Veteran
                  • May 2012
                  • 322
                  • USA

                  #28
                  Re: Vizio vp422hdtv10a won't turn on

                  Anybody have any idea's if the buffer is bad or is there another problem or something else to check?

                  Comment

                  • thorvauld
                    New Member
                    • Dec 2013
                    • 3
                    • US

                    #29
                    Re: Vizio vp422hdtv10a won't turn on

                    Have you checked the Y buffer to see if its grounding,from + to - at the plug from the Y main.

                    Comment

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